Chrysler 300M 2002 Service Manual page 1963

HEATING & A/C
Symptom:
A/C CONTROL BLEND DOOR INPUT OPEN OR SHORTED TO
GROUND (MANUAL A/C)
When Monitored and Set Condition:
A/C CONTROL BLEND DOOR INPUT OPEN OR SHORTED TO GROUND (MAN-
UAL A/C)
When Monitored: With the ignition on.
Set Condition: The BCM detects an abnormally low voltage (below 1.0 volts) on its blend
request input.
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
TEMPERATURE SELECT CKT SHORTED TO GROUND
TEMPERATURE SELECT CKT SHORTED TO SENSOR GROUND
TEMPERATURE SELECT CIRCUIT OPEN
CONTROL HEAD - TEMP SELECT OPEN/SHORT
BODY CONTROL MODULE - TEMP SELECT OPEN/SHORT
TEST
1 With the DRBIII , erase Body Controller DTC's.
Disconnect the Manual Temp Control Head C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?
Yes → Go To 2
→ Repair the Fused Ignition Switch Output circuit for an open.
No
2 Turn the ignition off.
Disconnect the Manual Temp Control Head C1 harness connector.
Disconnect the Body Control Module C2 harness connector.
Measure the resistance between ground and the Temperature Select circuit.
Is the resistance below 100.0 ohms?
Yes → Repair the Temperature Select circuit for a short to ground.
→ Go To 3
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
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APPLICABILITY
All
All